734 



8 and heloiiRS to llie exostichieal series. Tliis little tooth starts at the 

 same spot on the dental lamina as the connecting strand of the 

 enamelling organ and the first molar in fig. 8. 



These brief indications may suffice here to prove that the first 



Fig. 9. 



so-called molar of Perameles is exostichieal, i.e. a milk-tooth. From 

 what has been saitl here it becomes probable that the second molar 

 of Perameles is identical with the first molar of the Monodelphians. 

 For the first molar of Perameles is nothing else but the fourth milk- 

 molar which is not expelled and replaced like the third. The first 



